Loud-speaking telephone



Nov. ,22, 1927. 1,650,474

J. S. TIMMONS LOUD- SPEAKING TELEPHONE Filed March 8. 1922 2 Sheets-Sheet 1 .1. S. TIMMONS LOUD SEEAKING TELEPHONE Filed March 8. 1922 2 Sheets-Sheet 2 Patented Nov. 22, 1927.

' UNITED STATES PATENT OFFICE.

JOHN S. TIHHONS, OF PHILADELP A, PENNSYLVANIA.

LOUD-SPEAKING TELEPHONE Application fll'ed larch s, 1922. Serial 1%. 542,042.

One object of this invention is to provide a novel form of telephone receiver WlllCh shall include opposed poles rigidly supported and permanently spaced apart by suitable material, the invention contemplating an arrangement of parts including armature supports rigidly held by said poles.

A further object of the invention is to provide a telephone receiver including a novel mounting for a vibratory armature,-

together with novel means for adjustably connecting said armature to a diaphragm.

It is also desired to provide a telephone receiver in which the armature, pole pieces, coils and terminal connections are so designed and assembled as to form a structuraL 1y independent unit which as a whole may be assembled with the magnet, sound box and diaphragm' I also desire to provide a telephone instrument of the general character above described which shall be suitable and substantial .in construction, shall have itsparts so arranged that they may be easily and conveniently assembled, which shall be of a compact nature and shall include an internally threaded element particularly adapted for the reception of a horn connection, sound transmitting tube or an equivalent device ;the construction being of such a nature thatthe various parts shall tend to remain in their condition of final adjustment, shall not be likely to get out of order and shall efliciently perform the functions for which they are intended.

These objects and other advantageous ends I attain as hereinafter set forth, reference being bad to the accompanying drawings, in which,

Fig. 1 is a plan of a loud speaking telephone receiver constructed in accordance the supporting structures for the pole pieces, armature and coil;

ig. 7 is a perspective view of the upper pole piece, Fig. 8 is an end elevation of the connectmg rod between the armature and the diaphragm with certain of their associated parts; and

Fig. 9 is a vertical section on the line 9-9, Fig. 8.

In the above drawings, 1 represents a cirpular plate of any suitable material having its outer face recessed for the reception of a suitable diaphragm 2 clamped in position by a cover plate 3 which in accordance with my invention, is held in place by a series of screws 4 and has a central boss 5. Through .this boss extends a threaded opening 6 for the reception of a tube, or the like.

An enclosing casing 7 is fixed to the plate 1, which serves to support within the same a pair of similar blocks 8 and 9, which while preferably made of molded insulating material such as that substance known to the trade as bakelite, may be of brass, suitable shellac compound or other non-magnetic material. The first of these blocks 8 in the present case, is suspended from the plate 1 y a pair of bosses l010, while the second block 9 is similarly supported from said plate by a single boss 11;there being screws 12 extending through these two sets of bosses and r gidly holding the two blocks parallel with each other and in planes substantially at right angles to the plane of the plate 1.

Mounted on these two blocks 8 and 9 are a pair ofiron or steel pole pieces 13 (Fig. 7), each consisting of a pair of parallel elements 14' connected by a transverse element 15 extending between and held to said blocks by screws or other-suitable means. The two pairs of the pole piece elements 14 extend toward each other and have mounted be tween them a pair of parallel spaced bars 16 molded into or otherwise rigidly attached to one of the blocks as 9.. As shown in Figs. 5 and 7, said pole piece elements are preferably so formed at their outer ends as to extend partially between the bars 16 and rigidly clamp them from mov ment while being themselves rigidly held to the blocks. Between the two pairs of pole piece elements horn, sound transmitting tending between the bosses 10 14 and immovably mounted on the two bars 16 is a suitable spool or coil of wire 18 through which extends also an elongated armature 19 lying between and pivoted by a suitable pin or pintle 20 to said bars 16.

As shown in Fig. 9, an internally threaded socket or coupling member 21 is pivotally connected to one end of the armature by a pin 22, and a connecting rod 23 has one end threaded into said socket. Its opposite end, which is formed with a thread whose pitch is difl'erent from that of the socket, is in turn threaded through a bushing 24 mounted centrally in the diaphragm 2 and has a slot in its end, the arrangement being such that rotation of this connecting rod, while giving it a longitudinal motion relatively to the diaphragm due to its threaded connection therewith, will in addition give a differential movement to the socket '21 and hence to the armature connected thereto. By this means a delicate adjustment of the armature on its pivotal support may be obtained. On the block 9 for example, I provide a pair of suitably insulated terminal bolts 25 and 26 for connection to the ends of the wire coiled on the spool 18, and by means of suitable conductors entering the casing 7 through suitable openings also attached to these terminal bolts the instrument may be connected to an external circuit. In addition to the above parts, the receiver includes a permanent ma net 27 preferably of the horse shoe type .w ich embraces the two pole pieces 13 as indicated in Fig. 2, its body exand one of its poles terminating adjacent the boss 11. With the above described arrangement and construction, it is obvious that the several parts of my device may be accurately made and easily and'conveniently assembled, so that the two blocks with the pole pieces, coil, armature, anddiaphragm connecting .rod constitute a complete independent electrical unit. When so assembled, this unit may be carefully tested to ascertain the freedom of movement of the armature, etc.

and otherwise inspected prior to its assembly with the magnet 27.

that by the above construction a rigid support is provided for the armature and coil, so that under operating-conditions all vibrations of said armature are directly transmitted through the connecting rod to the diaphragm with a high degree of efliciency. h

A suitable opening is provided in plate 1 to permit of the free passage of the connecting rod 23' and I have found that best results are obtained when the blocks 8 and 9 are made of molded or other insulating material, although obviously under certain conditions a suitable non-magnetic metal may be substituted without departing from my invention. The device as a whole is compact and of such simple construction that likelihood of its getting out of order is practically negligible. By internally threading the opening 6 of the cover plate 3, I am enabled to provide a compact, mechanically strong connection wth the small end of a horn or speaking tube, which is an important item where compactness and a high degree of mechanical strength are desirable.

I claim:

1. The combination in a telephone instrument of a magnet; a diaphragm; two blocks; plates extending between said blocks and each having a pair of projecting pole pieces for the magnet; a coil between the pairs of pole pieces; a rigid structure fixed to one of the blocks and projecting into the coil; and an armature pivotally supported by said structure and connected to the diaphragm.

2. The combination in a telephone receiver of a magnet; a diaphragm; pole pieces for the magnet; a coil between the pole pieces; an armature for the coil; a rigld structure extending into the coil and pivotally supporting the armature therein; with an extensible element mechanically associating the armature and the diaphragm.

3. The combination in a telephone receiver of a magnet; a diaphragm;* ole pieces for the magnet; a coil between tiie pole pieces; an armature for the coil; a rigid structure extending into the coil and pivotally supporting the armature therein; with a connecting rod pivoted to the armature and adjustably attached to the diaphragm.

4. The combination in a telephone instruentof'a magnet; a diaphragm; a coil for the magnet; an oscillatory armature for the coil; and means for connecting said armature to the diaphragm including a two-part rod, one part constituting a socket.for the other and pivotally connected to the armature.

5. The combination in a telephone instrument of a magnet; a diaphragm; a coil for the magnet; an oscillatory armature for the coil; and means for connecting said armature to the diaphragm including a rod made in two parts threaded together, of which one part is threaded into the dia hragm.

6. The combination in a te ephone instrument of a magnet; a diaphragm; a coil for the magnet; an oscillatory armature for the coil; a threaded member connected to the armature; and a second member having two threads of difierent pitch of which one engages the first threaded member and the other adjustably engages the diaphragm.

7.'The combination in a telephone instrument of a magnet; a diaphragm; a supporting structure including two blocks; two bars projecting from one of the blocks toward the other; an armature pivoted between said bars; a coil for the magnet surrounding said bars and armature; with means for, transmitting vibrations from the armature to the diaphragm.

8. The combination in a telephone instrument of a magnet; a diaphragm; a supporting structure including two blocks; two bars projecting from one of the blocks toward the other; an armature pivoted between said bars; a coil for the magnet surrounding said bars and armature; with an adjustable connection between the armature and diaphragm.

9. The combination in a telephone receiver of a magnet; a diaphragm; a supporting structure including two blocks; two plates extending between said blocks and having pairs of projecting pole pieces; a coil ,mounted between the pairs of pole pieces; a rigid supporting structure gripped by the pole pieces and extending into the coil; and an armature pivoted to said structure within the coil and operatively connected to the diaphra y 10. The combination in a telephone recei'ver ofa magnet; a diaphragm; a support ing structure including two spaced blocks; two bloc a coil between the pole pieces; an armature between the pairs of pole pieces and pivoted to rigid extensions from one of the blocks; and means for operatively connecting the armature to the diaphragm.

11. The combination in a te ephone instrument of a diaphragm; a magnet; a coil for the magnet; an armature mounted to oscillate in the coil; a socket pivoted to one end of the armature and having a threaded portion; and a member having portions formed with threads of different pitch, one portion being threaded to the socket and the other threaded to the diaphragm.

12. The combination in a telephone instrument of a supporting structure including two blocks of non-magnetic material; a diaphragm carried thereby; a magnet; pole pieces for the magnet including plates extending between said blocks and having pairs of oles; a structure rigidl carried by one of the blocks and gripped etween the airs of opposed pole pieces between the pieces between which said pairs of poles; a coil mounted on said structure between the poles; an armature pivotally supported b the structure within the coil; and a member connecting one end of said armature with the diaphragm.

13. A unit structure for a telephone instrument consisting of two blocks; two plates connecting the blocks and respectively having pairs of pole pieces projecting towardeach other; a coil between the pole pieces; a structure carried by one of the blocks supporting .the coil; and an armature pivoted to the structure within the coil.

14; An armature for magnet telephones; fulcrum means for the armature, said armature and the fulcrum means having coacting parts detachably securing the fulcrum means in fixed relation to the armature, whereby said armature and the fulcrum means are combined in a single unit for arrangement in operative relationto the telephone magnet; a diaphragm; and means for connecting said armature to the diaphragm including a rod made in two parts threaded together, of which one partis threaded into the dia phragm.

15. In combination, a vibratory element; a vibratable mounted armature; and adjustable means for operatively associating-said armature and said element, said means comprising detachable sections having threads of differing itches.

16. A telep one instrument comprising an armature element; a diaphragm element; and means for so operatively associating said elements that the relative position thereof may be varied, said means comprising detachable-sections, one of said sections being adjustably secured to one of said vibratory elements.

17. Telephone apparatus comprising a pair of blocks; two bars pro ecting from one of the blocks toward the other; an armature.

mounted on said bars;, and a pair of pole bars may be gripped.

JOHN S. 't' 

